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Employee Benefits - Benefit Obligation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year $ 2,219    
Fair value of plan assets at end of year 1,987 $ 2,219  
Amounts recognized in consolidated balance sheets:      
Non-current liabilities (229) (244)  
Retirement Plans      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Net benefit obligation at beginning of year 2,329 2,260  
Service cost 3 3 $ 3
Interest cost 71 74 78
Plan participants’ contributions 0 0  
Actuarial loss (gain) (199) 107  
Gross benefits paid (103) (110)  
Foreign currency effect (26) 38  
Other adjustments 1 (43)  
Net benefit obligation at end of year 2,076 2,329 2,260
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 2,219 2,073  
Actual return on plan assets (113) 263  
Employer contributions 9 8  
Plan participants’ contributions 0 0  
Gross benefits paid (103) (110)  
Foreign currency effect (25) 31  
Other adjustments 0 (46)  
Fair value of plan assets at end of year 1,987 2,219 2,073
Funded status (89) (110)  
Amounts recognized in consolidated balance sheets:      
Non-current assets 125 114  
Current liabilities (9) (9)  
Non-current liabilities (205) (215)  
Total amounts recognized in consolidated balance sheets (89) (110)  
Accumulated benefit obligation 2,066 2,319  
Plans with accumulated benefit obligation in excess of the fair value of plan assets:      
Projected benefit obligation 214 224  
Accumulated benefit obligation 204 214  
Fair value of plan assets 0 0  
Amounts recognized in accumulated other comprehensive loss, net of tax:      
Net actuarial loss (gain) 460 451  
Prior service credit 2 1  
Total recognized 462 452  
Postretirement Plans      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Net benefit obligation at beginning of year 49 57  
Service cost 0 0 0
Interest cost 1 2 2
Plan participants’ contributions 3 3  
Actuarial loss (gain) (4) (5)  
Gross benefits paid (8) (8)  
Foreign currency effect 0 0  
Other adjustments (1) 0  
Net benefit obligation at end of year 40 49 57
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 20 0  
Actual return on plan assets 0 0  
Employer contributions 1 25  
Plan participants’ contributions 3 3  
Gross benefits paid (8) (8)  
Foreign currency effect 0 0  
Other adjustments 0 0  
Fair value of plan assets at end of year 16 20 $ 0
Funded status (24) (29)  
Amounts recognized in consolidated balance sheets:      
Non-current assets 0 0  
Current liabilities 0 0  
Non-current liabilities (24) (29)  
Total amounts recognized in consolidated balance sheets (24) (29)  
Amounts recognized in accumulated other comprehensive loss, net of tax:      
Net actuarial loss (gain) (41) (37)  
Prior service credit (14) (12)  
Total recognized $ (55) $ (49)